Article
Chemistry, Multidisciplinary
Aswin Kottapurath Vijay, Virender K. Sharma, Dan Meyerstein
Summary: Iron(II), Fe-II, plays a crucial role in various natural and biological reactions. Understanding the mechanism and rates of Fe-II oxidation by molecular oxygen (O-2) in the presence of bicarbonate (HCO3-) is essential due to its high concentration in environmental conditions. While previous studies suggested the formation of reactive oxygen species, this study demonstrates the rapid generation of carbonate radicals (CO3 center dot-) in Fe-II oxidation by O-2 in the presence of bicarbonate. The findings highlight the importance of considering CO3 center dot- formation in the geochemical cycling of iron and carbon.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Ana Paula Nogueira das Neves, Thayrine Dias Carlos, Leydiane Barbosa Bezerra, Whisley Duraes Alceno, Renato Almeida Sarmento, Nelson Luis Goncalves Dias de Souza, Douglas Henrique Pereira, Grasiele Soares Cavallini
Summary: The research investigated the use of combinations involving Na2CO3 with solar radiation or peracetic acid (PAA) to generate carbonate anion radicals for the degradation of persistent environmental contaminants. The combination of PAA + Na2CO3 was effective in degrading dyes even without solar radiation, although at a slower rate. The degradation process followed a first-order kinetic model.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Review
Chemistry, Analytical
Wanchao Yu, Lixia Zhao
Summary: ROS, as important oxidizing species in ecosystems, play various roles and monitoring their concentration is crucial for the environment. The chemiluminescence method has attracted attention for ROS detection due to its high sensitivity and simplicity, showing advances in recent years.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2021)
Article
Spectroscopy
Yanhui Liu, Guanjun Wang, Yanying Zhao
Summary: The infrared photodissociation spectroscopy was used to characterize the nitrobenzene radical anion (NB-). The results showed that NB(Ar)- had eight strong peaks in the fingerprint region which could be assigned to different vibrational modes. By comparing with density functional theoretical (DFT) calculation, it was proved that this method could effectively characterize the structures of NB(Ar)- and other NBn (n > 1) clusters.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Biotechnology & Applied Microbiology
Che-Yung Kuan, Yu-Ying Lin, I-Hsuan Yang, Ching-Yun Chen, Chih-Ying Chi, Chi-Han Li, Zhi-Yu Chen, Li-Ze Lin, Chun-Chen Yang, Feng-Huei Lin
Summary: The study demonstrated that europium-doped calcium carbonate, when combined with low-intensity ultrasound, significantly reduced body weight, waistline, and subcutaneous adipose tissue in SD rats, showing good biocompatibility. It is believed that the generation of reactive oxygen species, CO2-bombs, and locally increasing Ca2+ levels are the major mechanisms for adipose tissue removal and inhibition of adipogenesis. The combination of CaCO3: Eu and low-intensity ultrasound is proposed as a non-invasive treatment for body sculpting.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Ying Chen, Yi Mu, Lei Tian, Ling-Ling Zheng, Yi Mei, Qiu-Ju Xing, Wen Liu, Jian-Ping Zou, Lixia Yang, Shenglian Luo, Daishe Wu
Summary: Traditional methods are not efficient in recovering Cu from Cu(II)-EDTA wastewater and result in the formation of secondary contaminants. This study proposes an ozone/percarbonate (O3/SPC) process that can efficiently decomplex Cu(II)-EDTA and recover Cu simultaneously. The results show that the O3/SPC process achieves 100% Cu recovery with a kobs value of 0.103 min-1, compared to 81.2% recovery and a kobs value of 0.042 min-1 for the typical ·OH-based O3/H2O2 process. The O3/SPC process generates the carbonate radical anion (CO3·-) to selectively attack the amino groups of Cu(II)-EDTA, leading to the cleavage of Cu-O and Cu-N bonds.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Medicine, Research & Experimental
Liangliang Tao, Xiucai Fan, Jin Sun, Zhu Zhang
Summary: Metformin can reduce high glucose-induced endothelial reactive oxygen species generation by upregulating OGG1. Furthermore, the stability of OGG1 protein expression is related to mRNA stability, which can be reversed by genetic inhibition of AMPK alpha and Lin-28.
Article
Engineering, Environmental
Jiong Gao, Roberta Frinhani Nunes, Kevin O'Shea, Greg L. Saylor, Lingjun Bu, Yu-Gyeong Kang, Xiaodi Duan, Dionysios D. Dionysiou, Shenglian Luo
Summary: This study investigates the impact of water quality parameters on the formation of radical anions and BPA degradation in UV/SPC and UV/H2O2 systems. The rise in pH decreases the steady state concentration of HO•, resulting in a decrease in BPA degradation rate.
Article
Biochemical Research Methods
Xiaowei Lan, Yujie Dai, Wenjie Jing, Xuan Meng, Fufeng Liu, Sen Wang, Ao He, Nan Li
Summary: In this study, the reaction mechanisms and energy barriers of CO2-containing systems with hydroxyl radical were investigated using density functional theory. The results show that the reaction of hydroxyl with HCO3- has the lowest energy barrier and the maximum reaction rate constant, while the reaction of hydroxyl radical with CO2 has the highest energy barrier and the minimum reaction rate constant. The dissociation process indicates that HCO3- is a strong acid and hydroxyl radicals are spontaneously converted to carbonate radical anions in CO2-containing systems.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2022)
Article
Chemistry, Physical
Ali Shafiee, Behzad Aibaghi, Andrew J. Carrier, Muhammad Fahad Ehsan, Collins Nganou, Xu Zhang, Ken D. Oakes
Summary: The combination of black titanium dioxide and reduced graphene oxide has shown to be an efficient photocatalyst for degradation of organic pollutants, utilizing the full solar spectrum and achieving rapid degradation under simulated sunlight. This composite material is a promising technology for sustainable environmental remediation.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Aswin Kottapurath Vijay, Vered Marks, Amir Mizrahi, Yinghao Wen, Xingmao Ma, Virender K. Sharma, Dan Meyerstein
Summary: This study investigated the kinetics and mechanisms of the reactions between Feaq II and PMS or PDS at different pH values, as well as the influence of bicarbonate (HCO3-). The results showed that FeaqIV was the dominant oxidizing species in the absence of HCO3-. In the presence of environmentally relevant concentrations of HCO3-, carbonate radical anion (CO3 center dot-) became the dominant reactive species. These findings provide insights for advancing persulfate-based advanced oxidation processes (AOPs) in oxidizing pollutants in natural water.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Chinmaya Mutalik, Dyah Ika Krisnawati, Shivaraj B. Patil, Muhamad Khafid, Didik Susetiyanto Atmojo, Puguh Santoso, Ssu-Chiao Lu, Di-Yan Wang, Tsung-Rong Kuo
Summary: Metallic phase 1T-MoS2 nanoflowers and semiconducting phase 2H-MoS2 nanoflowers were prepared through a solvothermal and combustion method, demonstrating antibacterial activities and mechanisms against Escherichia coli under light irradiation. The metallic 1T-MoS2 nanoflowers showed higher light-driven antibacterial activity compared to the semiconducting 2H-MoS2 nanoflowers, with EPR spectroscopy confirming the generation of ROS due to photoinduced electrons from the metallic nanoflowers. Photoinduced electrons from metallic 1T-MoS2 nanoflowers reacted with oxygen to induce bacterial death, while rapid recombination of photoinduced electrons and holes in the semiconducting 2H-MoS2 nanoflowers resulted in decreased ROS generation and diminished antibacterial activity.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Matthew Nava, Agnes E. Thorarinsdottir, Nazario Lopez, Christopher C. Cummins, Daniel G. Nocera
Summary: Understanding the redox reactions and processes in metal-air and specifically lithium-air batteries, especially the chemistry of peroxide dianion O22-, is crucial for the advancement of this promising energy-storage technology. The electron transfer kinetics and redox reaction chemistry of isolated peroxide dianion encapsulated within a hexacarboxamide cryptand are reviewed. Further research on the electron transfer properties and the chemical reactions of peroxide dianion will contribute to the development of rechargeable lithium-air batteries.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Rui Chen, Qiuyue Li, Zhiwei Zhang, Kai Xu, Lijie Sun, Jinkang Ma, Tianhua Wang, Xueting Mu, Yan Xi, Lifeng Cao, Bing Teng, Haitao Wu
Summary: The solvent effect on the ESIPT process of N-(8-Quinolyl) salicylaldimine (QS) was investigated using DFT and TD-DFT methods. Different solvents (TOL, THF, ACE and DMSO) were chosen to simulate experimental conditions. The structures and hydrogen bond interactions of QS in the S0 and S1 states were studied, showing that the hydrogen bond is strengthened in the excited state and weakened with increasing dielectric constant of the solvents. The calculated absorption and fluorescence spectra agreed with experimental evidence. The energy barriers of QS in different solvents were analyzed, indicating that ESIPT is favored with increasing dielectric constant of solvents.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Review
Biochemistry & Molecular Biology
Yang Liu, Shujun Zhou, Du Xiang, Lingao Ju, Dexin Shen, Xinghuan Wang, Yanfeng Wang
Summary: Acute lung injury (ALI) is a condition caused by various factors leading to acute hypoxic respiratory insufficiency, with oxidative stress playing a significant role in its pathogenesis. While antioxidants can alleviate ALI by scavenging ROS, they may have no significant effect and could even aggravate severe organ injury.